Like others are saying, it sounds like you've got a really weird obsession, of the OCD variety, and could possibly get this thing straightened out.
You're also missing out on so, so much good music, including tons of positive and powerful songs that use these topics in their narrative in a positive way, or as something to overcome.

Only peripherally related to your question, and I suspect FAR more frequent, is what I do: I'm a lifelong metalhead, and I simply don't/can`t listen to music with negative, as in morally/ethically, messages (i.e., condoning certain forms of violence, racism, sexism, etc.,). My strong distaste for this sort of think ranges from "eww, that's lame I don't think I like/respect this song/band that much" to "I absolutely won't listen to anymore of these losers".